Arcane Drill

Research has led to a breakthrough! The blunt teeth on this roller cone bit pulverize material to dust. 

Drill 2D8 Bludgeoning Damage

As a bonus action, you can burrow underground in most terrain and move at a rate of half your movement speed in soft soil like dirt or sand, and 1/3 your movement speed in more solid terrain like stone. While burrowed you cannot see or hear what is happening on the surface unless another effect enables you to do so. you may announce a specific location you wish to travel before burrowing, if you choose to go to a different location than the one initially specified, make a history check (dc determined by dm) to gauge your recollection of its location. 

Additionally, the area above ground during the burrowing process bulges, revealing your location and making the ground rough terrain in a 2 foot wide line following the path you've taken. 

 

This item has a number of charges equal to twice your proficiency bonus, (resets daily at dawn). As a bonus action you can expend a charge to increase the drills speed and its arcane propulsion. If you are above ground you dash 15 feet forward, any enemies in your path must succeed on a constitution saving throw or be pushed 5 feet away and take 2D6 bludgeoning  damage, or half as much with a successful save. Additionally any enemies who fail the constitution saving throw must also succeed on an athletics check or be knocked prone.

If you are burrowing when you expend a charge, your burrowing speed increases to match your normal movement speed until your next turn.

Proficiency with a Maul allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Notes: Damage: Bludgeoning, Twice proficiency bonus, Artificer, Heavy, Two-Handed, Topple